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Lust M, Vitebskiy I, Anisimov I, Ghalichechian N. Thermo-optic VO 2-based silicon waveguide mid-infrared router with asymmetric activation thresholds and large bi-stability. OPTICS EXPRESS 2023; 31:23260-23273. [PMID: 37475415 DOI: 10.1364/oe.493895] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 06/16/2023] [Indexed: 07/22/2023]
Abstract
We report a novel four-port optical router that exploits non-linear properties of vanadium dioxide (VO2) phase-change material to achieve asymmetrical power threshold response with power limiting capability. The scope of this study lies within the concept, modeling, and simulation of the device, with practical considerations in mind for future experimental devices. The waveguide structure, designed to operate at the wavelength of 5.0 µm, is composed of a silicon core with air and silicon dioxide forming the cladding layers. Two ring resonators are employed to couple two straight waveguides, thus four individual ports. One of the ring resonators has a 100-nm-thick VO2 layer responsible for non-linear behavior of the device. The router achieves 56.5 and 64.5 dB of power limiting at the forward and reverse operating modes, respectively. Total transmission in the inactivated mode is 75%. Bi-stability and latching behavior are demonstrated and discussed.
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2
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Heterogeneous integration of single-crystalline rutile nanomembranes with steep phase transition on silicon substrates. Nat Commun 2021; 12:5019. [PMID: 34408136 PMCID: PMC8373986 DOI: 10.1038/s41467-021-24740-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 06/29/2021] [Indexed: 11/28/2022] Open
Abstract
Unrestricted integration of single-crystal oxide films on arbitrary substrates has been of great interest to exploit emerging phenomena from transition metal oxides for practical applications. Here, we demonstrate the release and transfer of a freestanding single-crystalline rutile oxide nanomembranes to serve as an epitaxial template for heterogeneous integration of correlated oxides on dissimilar substrates. By selective oxidation and dissolution of sacrificial VO2 buffer layers from TiO2/VO2/TiO2 by H2O2, millimeter-size TiO2 single-crystalline layers are integrated on silicon without any deterioration. After subsequent VO2 epitaxial growth on the transferred TiO2 nanomembranes, we create artificial single-crystalline oxide/Si heterostructures with excellent sharpness of metal-insulator transition (\documentclass[12pt]{minimal}
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\begin{document}$$\triangle \rho /\rho$$\end{document}△ρ/ρ > 103) even in ultrathin (<10 nm) VO2 films that are not achievable via direct growth on Si. This discovery offers a synthetic strategy to release the new single-crystalline oxide nanomembranes and an integration scheme to exploit emergent functionality from epitaxial oxide heterostructures in mature silicon devices. Unrestricted integration of single-crystal oxide films on Si substrates allows for exploitation of emerging functionality of new materials in mature silicon devices. Here the authors integrate epitaxial oxide films with sharp metal-insulator transition on Si substrates by epitaxial lift-off of a freestanding nanomembrane.
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Han K, Wu L, Cao Y, Wang H, Ye C, Huang K, Motapothula M, Xing H, Li X, Qi DC, Li X, Renshaw Wang X. Enhanced Metal-Insulator Transition in Freestanding VO 2 Down to 5 nm Thickness. ACS APPLIED MATERIALS & INTERFACES 2021; 13:16688-16693. [PMID: 33793182 DOI: 10.1021/acsami.1c01581] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Ultrathin freestanding membranes with a pronounced metal-insulator transition (MIT) have huge potential for future flexible electronic applications as well as provide a unique aspect for the study of lattice-electron interplay. However, the reduction of the thickness to an ultrathin region (a few nm) is typically detrimental to the MIT in epitaxial films, and even catastrophic for their freestanding form. Here, we report an enhanced MIT in VO2-based freestanding membranes, with a lateral size up to millimeters and the VO2 thickness down to 5 nm. The VO2 membranes were detached by dissolving a Sr3Al2O6 sacrificial layer between the VO2 thin film and the c-Al2O3(0001) substrate, allowing the transfer onto arbitrary surfaces. Furthermore, the MIT in the VO2 membrane was greatly enhanced by inserting an intermediate Al2O3 buffer layer. In comparison with the best available ultrathin VO2 membranes, the enhancement of MIT is over 400% at a 5 nm VO2 thickness and more than 1 order of magnitude for VO2 above 10 nm. Our study widens the spectrum of functionality in ultrathin and large-scale membranes and enables the potential integration of MIT into flexible electronics and photonics.
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Affiliation(s)
- Kun Han
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Liang Wu
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
- School of Material Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China
| | - Yu Cao
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3 117583, Singapore
| | - Hanyu Wang
- Center for Quantum Transport and Thermal Energy Science (CQTES), School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
| | - Chen Ye
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Ke Huang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - M Motapothula
- Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala SE-75120, Sweden
- Department of Physics, SRM University AP, Amaravati, Andhra Pradesh 522-502, India
| | - Hongna Xing
- School of Physics, Northwest University, Xi'an 710069, China
| | - Xinghua Li
- School of Physics, Northwest University, Xi'an 710069, China
| | - Dong-Chen Qi
- Centre for Materials Science, School of Chemistry and Physics, Queensland University of Technology, Brisbane, Queensland 4001, Australia
| | - Xiao Li
- Center for Quantum Transport and Thermal Energy Science (CQTES), School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
| | - X Renshaw Wang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
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Hong S, Lee M, Kim D. An Invariable Temperature during the Phase Transition of W Doped VO
2
Film. B KOREAN CHEM SOC 2020. [DOI: 10.1002/bkcs.11975] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Seong‐Cheol Hong
- Department of ChemistryPukyong National University Busan 48513 South Korea
| | - Myeongsoon Lee
- Department of ChemistryPukyong National University Busan 48513 South Korea
| | - Don Kim
- Department of ChemistryPukyong National University Busan 48513 South Korea
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5
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Tian Z, Xu B, Hsu B, Stan L, Yang Z, Mei Y. Reconfigurable Vanadium Dioxide Nanomembranes and Microtubes with Controllable Phase Transition Temperatures. NANO LETTERS 2018; 18:3017-3023. [PMID: 29633849 DOI: 10.1021/acs.nanolett.8b00483] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Two additional structural forms, free-standing nanomembranes and microtubes, are reported and added to the vanadium dioxide (VO2) material family. Free-standing VO2 nanomembranes were fabricated by precisely thinning as-grown VO2 thin films and etching away the sacrificial layer underneath. VO2 microtubes with a range of controllable diameters were rolled-up from the VO2 nanomembranes. When a VO2 nanomembrane is rolled-up into a microtubular structure, a significant compressive strain is generated and accommodated therein, which decreases the phase transition temperature of the VO2 material. The magnitude of the compressive strain is determined by the curvature of the VO2 microtube, which can be rationally and accurately designed by controlling the tube diameter during the rolling-up fabrication process. The VO2 microtube rolling-up process presents a novel way to controllably tune the phase transition temperature of VO2 materials over a wide range toward practical applications. Furthermore, the rolling-up process is reversible. A VO2 microtube can be transformed back into a nanomembrane by introducing an external strain. Because of its tunable phase transition temperature and reversible shape transformation, the VO2 nanomembrane-microtube structure is promising for device applications. As an example application, a tubular microactuator device with low driving energy but large displacement is demonstrated at various triggering temperatures.
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Affiliation(s)
- Ziao Tian
- Department of Materials Science, State Key Laboratory of ASIC and Systems , Fudan University , 200433 Shanghai , PR China
| | - Borui Xu
- Department of Materials Science, State Key Laboratory of ASIC and Systems , Fudan University , 200433 Shanghai , PR China
| | - Bo Hsu
- Department of Electrical and Computer Engineering , University of Illinois at Chicago , Chicago , Illinois 60607 , United States
| | - Liliana Stan
- Center for Nanoscale Materials , Argonne National Laboratory , Lemont , Illinois 60439 , United States
| | - Zheng Yang
- Department of Electrical and Computer Engineering , University of Illinois at Chicago , Chicago , Illinois 60607 , United States
| | - YongFeng Mei
- Department of Materials Science, State Key Laboratory of ASIC and Systems , Fudan University , 200433 Shanghai , PR China
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6
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Fadlelmula MM, Sürmeli EC, Ramezani M, Kasırga TS. Effects of Thickness on the Metal-Insulator Transition in Free-Standing Vanadium Dioxide Nanocrystals. NANO LETTERS 2017; 17:1762-1767. [PMID: 28221803 DOI: 10.1021/acs.nanolett.6b05067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Controlling solid state phase transitions via external stimuli offers rich physics along with possibilities of unparalleled applications in electronics and optics. The well-known metal-insulator transition (MIT) in vanadium dioxide (VO2) is one instance of such phase transitions emerging from strong electronic correlations. Inducing the MIT using electric field has been investigated extensively for the applications in electrical and ultrafast optical switching. However, as the Thomas-Fermi screening length is very short, for considerable alteration in the material's properties with electric field induced MIT, crystals below 10 nm are needed. So far, the only way to achieve thin crystals of VO2 has been via epitaxial growth techniques. Yet, stress due to lattice mismatch as well as interdiffusion with the substrate complicate the studies. Here, we show that free-standing vapor-phase grown crystals of VO2 can be milled down to the desired thickness using argon ion-beam milling without compromising their electronic and structural properties. Among our results, we show that even below 4 nm thickness the MIT persists and the transition temperature is lowered in two-terminal devices as the crystal gets thinner. The findings in this Letter can be applied to similar strongly correlated materials to study quantum confinement effects.
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Affiliation(s)
- Mustafa M Fadlelmula
- National Nanotechnology Research Center, ‡Institute of Materials Science and Nanotechnology, and §Department of Physics, Bilkent University , Bilkent, Ankara 06800, Turkey
| | - Engin C Sürmeli
- National Nanotechnology Research Center, ‡Institute of Materials Science and Nanotechnology, and §Department of Physics, Bilkent University , Bilkent, Ankara 06800, Turkey
| | - Mehdi Ramezani
- National Nanotechnology Research Center, ‡Institute of Materials Science and Nanotechnology, and §Department of Physics, Bilkent University , Bilkent, Ankara 06800, Turkey
| | - T Serkan Kasırga
- National Nanotechnology Research Center, ‡Institute of Materials Science and Nanotechnology, and §Department of Physics, Bilkent University , Bilkent, Ankara 06800, Turkey
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7
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McGahan C, Gamage S, Liang J, Cross B, Marvel RE, Haglund RF, Abate Y. Geometric constraints on phase coexistence in vanadium dioxide single crystals. NANOTECHNOLOGY 2017; 28:085701. [PMID: 28045000 DOI: 10.1088/1361-6528/aa5652] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The appearance of stripe phases is a characteristic signature of strongly correlated quantum materials, and its origin in phase-changing materials has only recently been recognized as the result of the delicate balance between atomic and mesoscopic materials properties. A vanadium dioxide (VO2) single crystal is one such strongly correlated material with stripe phases. Infrared nano-imaging on low-aspect-ratio, single-crystal VO2 microbeams decorated with resonant plasmonic nanoantennas reveals a novel herringbone pattern of coexisting metallic and insulating domains intercepted and altered by ferroelastic domains, unlike previous reports on high-aspect-ratio VO2 crystals where the coexisting metal/insulator domains appear as alternating stripe phases perpendicular to the growth axis. The metallic domains nucleate below the crystal surface and grow towards the surface with increasing temperature as suggested by the near-field plasmonic response of the gold nanorod antennas.
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Affiliation(s)
- Christina McGahan
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235-1807, United States
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Ding Z, Cui Y, Wan D, Luo H, Gao Y. High-performance thermal sensitive VO2(B) thin films prepared by sputtering with TiO2(A) buffer layer and first-principles calculations study. RSC Adv 2017. [DOI: 10.1039/c7ra03239k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We present an effective strategy to modify the electronic properties of VO2(B) by inducing elastic strain with TiO2(A) buffer layer.
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Affiliation(s)
- Zhuohan Ding
- School of Materials Science and Engineering
- Shanghai University
- Shanghai 200444
- China
| | - Yuanyuan Cui
- School of Materials Science and Engineering
- Shanghai University
- Shanghai 200444
- China
| | - Dongyun Wan
- School of Materials Science and Engineering
- Shanghai University
- Shanghai 200444
- China
| | - Hongjie Luo
- School of Materials Science and Engineering
- Shanghai University
- Shanghai 200444
- China
| | - Yanfeng Gao
- School of Materials Science and Engineering
- Shanghai University
- Shanghai 200444
- China
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